<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <p>{{this.name==true? name1:name2}}</p>
        <button @click="fn">逆转世界</button>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.16/dist/vue.js"></script>
    <script>
        const app = new Vue({
            el:'#app',
            data:{
                name,
                name1:'Hello,World',
                name2:'dlroW,olleH'
            },
            methods:{
                fn(){
                    this.name = !this.name
                }
            }
            
        })
    </script>
</body>
</html>